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<a name="DBX-Options"></a>
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<hr>
<a name="Specific-Options-for-DBX-Output"></a>
<h4 class="subsection">18.21.2 Specific Options for DBX Output</h4>

<p>These are specific options for DBX output.
</p>
<dl>
<dt><a name="index-DBX_005fDEBUGGING_005fINFO"></a>Macro: <strong>DBX_DEBUGGING_INFO</strong></dt>
<dd><p>Define this macro if GCC should produce debugging output for DBX
in response to the <samp>-g</samp> option.
</p></dd></dl>

<dl>
<dt><a name="index-XCOFF_005fDEBUGGING_005fINFO"></a>Macro: <strong>XCOFF_DEBUGGING_INFO</strong></dt>
<dd><p>Define this macro if GCC should produce XCOFF format debugging output
in response to the <samp>-g</samp> option.  This is a variant of DBX format.
</p></dd></dl>

<dl>
<dt><a name="index-DEFAULT_005fGDB_005fEXTENSIONS"></a>Macro: <strong>DEFAULT_GDB_EXTENSIONS</strong></dt>
<dd><p>Define this macro to control whether GCC should by default generate
GDB&rsquo;s extended version of DBX debugging information (assuming DBX-format
debugging information is enabled at all).  If you don&rsquo;t define the
macro, the default is 1: always generate the extended information
if there is any occasion to.
</p></dd></dl>

<dl>
<dt><a name="index-DEBUG_005fSYMS_005fTEXT"></a>Macro: <strong>DEBUG_SYMS_TEXT</strong></dt>
<dd><p>Define this macro if all <code>.stabs</code> commands should be output while
in the text section.
</p></dd></dl>

<dl>
<dt><a name="index-ASM_005fSTABS_005fOP"></a>Macro: <strong>ASM_STABS_OP</strong></dt>
<dd><p>A C string constant, including spacing, naming the assembler pseudo op to
use instead of <code>&quot;\t.stabs\t&quot;</code> to define an ordinary debugging symbol.
If you don&rsquo;t define this macro, <code>&quot;\t.stabs\t&quot;</code> is used.  This macro
applies only to DBX debugging information format.
</p></dd></dl>

<dl>
<dt><a name="index-ASM_005fSTABD_005fOP"></a>Macro: <strong>ASM_STABD_OP</strong></dt>
<dd><p>A C string constant, including spacing, naming the assembler pseudo op to
use instead of <code>&quot;\t.stabd\t&quot;</code> to define a debugging symbol whose
value is the current location.  If you don&rsquo;t define this macro,
<code>&quot;\t.stabd\t&quot;</code> is used.  This macro applies only to DBX debugging
information format.
</p></dd></dl>

<dl>
<dt><a name="index-ASM_005fSTABN_005fOP"></a>Macro: <strong>ASM_STABN_OP</strong></dt>
<dd><p>A C string constant, including spacing, naming the assembler pseudo op to
use instead of <code>&quot;\t.stabn\t&quot;</code> to define a debugging symbol with no
name.  If you don&rsquo;t define this macro, <code>&quot;\t.stabn\t&quot;</code> is used.  This
macro applies only to DBX debugging information format.
</p></dd></dl>

<dl>
<dt><a name="index-DBX_005fNO_005fXREFS"></a>Macro: <strong>DBX_NO_XREFS</strong></dt>
<dd><p>Define this macro if DBX on your system does not support the construct
&lsquo;<samp>xs<var>tagname</var></samp>&rsquo;.  On some systems, this construct is used to
describe a forward reference to a structure named <var>tagname</var>.
On other systems, this construct is not supported at all.
</p></dd></dl>

<dl>
<dt><a name="index-DBX_005fCONTIN_005fLENGTH"></a>Macro: <strong>DBX_CONTIN_LENGTH</strong></dt>
<dd><p>A symbol name in DBX-format debugging information is normally
continued (split into two separate <code>.stabs</code> directives) when it
exceeds a certain length (by default, 80 characters).  On some
operating systems, DBX requires this splitting; on others, splitting
must not be done.  You can inhibit splitting by defining this macro
with the value zero.  You can override the default splitting-length by
defining this macro as an expression for the length you desire.
</p></dd></dl>

<dl>
<dt><a name="index-DBX_005fCONTIN_005fCHAR"></a>Macro: <strong>DBX_CONTIN_CHAR</strong></dt>
<dd><p>Normally continuation is indicated by adding a &lsquo;<samp>\</samp>&rsquo; character to
the end of a <code>.stabs</code> string when a continuation follows.  To use
a different character instead, define this macro as a character
constant for the character you want to use.  Do not define this macro
if backslash is correct for your system.
</p></dd></dl>

<dl>
<dt><a name="index-DBX_005fSTATIC_005fSTAB_005fDATA_005fSECTION"></a>Macro: <strong>DBX_STATIC_STAB_DATA_SECTION</strong></dt>
<dd><p>Define this macro if it is necessary to go to the data section before
outputting the &lsquo;<samp>.stabs</samp>&rsquo; pseudo-op for a non-global static
variable.
</p></dd></dl>

<dl>
<dt><a name="index-DBX_005fTYPE_005fDECL_005fSTABS_005fCODE"></a>Macro: <strong>DBX_TYPE_DECL_STABS_CODE</strong></dt>
<dd><p>The value to use in the &ldquo;code&rdquo; field of the <code>.stabs</code> directive
for a typedef.  The default is <code>N_LSYM</code>.
</p></dd></dl>

<dl>
<dt><a name="index-DBX_005fSTATIC_005fCONST_005fVAR_005fCODE"></a>Macro: <strong>DBX_STATIC_CONST_VAR_CODE</strong></dt>
<dd><p>The value to use in the &ldquo;code&rdquo; field of the <code>.stabs</code> directive
for a static variable located in the text section.  DBX format does not
provide any &ldquo;right&rdquo; way to do this.  The default is <code>N_FUN</code>.
</p></dd></dl>

<dl>
<dt><a name="index-DBX_005fREGPARM_005fSTABS_005fCODE"></a>Macro: <strong>DBX_REGPARM_STABS_CODE</strong></dt>
<dd><p>The value to use in the &ldquo;code&rdquo; field of the <code>.stabs</code> directive
for a parameter passed in registers.  DBX format does not provide any
&ldquo;right&rdquo; way to do this.  The default is <code>N_RSYM</code>.
</p></dd></dl>

<dl>
<dt><a name="index-DBX_005fREGPARM_005fSTABS_005fLETTER"></a>Macro: <strong>DBX_REGPARM_STABS_LETTER</strong></dt>
<dd><p>The letter to use in DBX symbol data to identify a symbol as a parameter
passed in registers.  DBX format does not customarily provide any way to
do this.  The default is <code>'P'</code>.
</p></dd></dl>

<dl>
<dt><a name="index-DBX_005fFUNCTION_005fFIRST"></a>Macro: <strong>DBX_FUNCTION_FIRST</strong></dt>
<dd><p>Define this macro if the DBX information for a function and its
arguments should precede the assembler code for the function.  Normally,
in DBX format, the debugging information entirely follows the assembler
code.
</p></dd></dl>

<dl>
<dt><a name="index-DBX_005fBLOCKS_005fFUNCTION_005fRELATIVE"></a>Macro: <strong>DBX_BLOCKS_FUNCTION_RELATIVE</strong></dt>
<dd><p>Define this macro, with value 1, if the value of a symbol describing
the scope of a block (<code>N_LBRAC</code> or <code>N_RBRAC</code>) should be
relative to the start of the enclosing function.  Normally, GCC uses
an absolute address.
</p></dd></dl>

<dl>
<dt><a name="index-DBX_005fLINES_005fFUNCTION_005fRELATIVE"></a>Macro: <strong>DBX_LINES_FUNCTION_RELATIVE</strong></dt>
<dd><p>Define this macro, with value 1, if the value of a symbol indicating
the current line number (<code>N_SLINE</code>) should be relative to the
start of the enclosing function.  Normally, GCC uses an absolute address.
</p></dd></dl>

<dl>
<dt><a name="index-DBX_005fUSE_005fBINCL"></a>Macro: <strong>DBX_USE_BINCL</strong></dt>
<dd><p>Define this macro if GCC should generate <code>N_BINCL</code> and
<code>N_EINCL</code> stabs for included header files, as on Sun systems.  This
macro also directs GCC to output a type number as a pair of a file
number and a type number within the file.  Normally, GCC does not
generate <code>N_BINCL</code> or <code>N_EINCL</code> stabs, and it outputs a single
number for a type number.
</p></dd></dl>

<hr>
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